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I have no calipers, but I can measure the spines and the widths to within 1/64" using a ruler, which translates to about 0.5degree error in the angle so that's what I did.

I used several vintage...

That's very easy to do, but I don't see how it is useful. It seems a math trivia to me with no bearing on shaving unless we have some data that correlate the angle with the shaving.

The angle is easy to compute. The problem is that so far I have not seen any evidence of how that angle correlates with the shaving.

Yes, I can see that the extremes won't work, but if 99% of the...